^^^^^ This.
Prep. Treat the interview as you would a check ride.
Get HR prep. The better prep companies won’t give you “canned” answers but will help you refine your answers, give you a chance to practice different questions with an impartial observer and have some answers ready. Maybe critique things- if your answers sound like a George Carlin skit you may need some work. If every other word out of your mouth is “uhhh” and “ummmm”, you may need some work. If your “tell me about yourself” takes 10 minutes you may need some work.
This is a million dollar interview. Treat it as such.